to trigger/signal a rebuild for the transition 5.8.8 -> 5.10.0.
The list of packages is computed by finding all packages which end
up having either of PERL5_USE_PACKLIST, BUILDLINK_API_DEPENDS.perl,
or PERL5_PACKLIST defined in their make setup (tested via
"make show-vars VARNAMES=...").
This module provides a convenient way to perform cleanup or other
forms of resource management at the end of a scope. It is particularly
useful when dealing with exceptions: the Scope::Guard constructor
takes a reference to a subroutine that is guaranteed to be called
even if the thread of execution is aborted prematurely. This
effectively allows lexically-scoped "promises" to be made that are
automatically honoured by perl's garbage collector.